The bridge over the Euphrates river in Falluja, as it looks today. Four years earlier, the remains of four private contractors were hung there after being killed and mutilated by insurgents. (Photo: Ali al-Saadi/Agence France-Presse — Getty Images) BAGHDAD — This spring I needed to interview former detainees in American detention centers who had recently been released, so I went to Anbar Province, a vast western desert area of Iraq that lies between Baghdad and Jordan. It is best known for the turbulent town of Falluja, which became a headquarters for Al Qaeda in Iraq and where the Americans fought bloody battles in 2004. It then became something of a ghost town peopled almost exclusively by fighters. Eventually, the Marines completely controlled it and the violence migrated elsewhere. But many of those who had been detained...
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